feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/llm/test/route.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, test } from "bun:test"
+import * as OpenAIChat from "../src/protocols/openai-chat"
+import { Auth } from "../src/route"
+
+describe("Route.with", () => {
+  test("merges endpoint query and header defaults while replacing auth and id", () => {
+    const auth = Auth.headers({ "x-auth": "new" })
+    const route = OpenAIChat.route
+      .with({
+        id: "base-chat",
+        endpoint: {
+          baseURL: "https://api.example.test/v1",
+          query: { keep: "base", base: "1" },
+        },
+        headers: { "x-base": "base", "x-override": "base" },
+        auth: Auth.headers({ "x-auth": "old" }),
+      })
+      .with({
+        id: "patched-chat",
+        endpoint: { query: { keep: "patch", patch: "1" } },
+        headers: { "x-override": "patch", "x-patch": "patch" },
+        auth,
+      })
+
+    expect(route.id).toBe("patched-chat")
+    expect(route.auth).toBe(auth)
+    expect(route.endpoint).toMatchObject({
+      baseURL: "https://api.example.test/v1",
+      path: "/chat/completions",
+      query: { keep: "patch", base: "1", patch: "1" },
+    })
+    expect(route.defaults.headers).toEqual({
+      "x-base": "base",
+      "x-override": "patch",
+      "x-patch": "patch",
+    })
+    expect(route.defaults.http?.headers).toEqual({
+      "x-base": "base",
+      "x-override": "patch",
+      "x-patch": "patch",
+    })
+  })
+})